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In humans, the red nucleus mainly controls the muscles of the shoulder and upper arm, but it has some control over the lower arm and hand as well. It is less important in its motor functions for humans than in many other mammals, because, in humans, the corticospinal tract is dominant. However the crawling of babies is controlled by the red nucleus, as is arm-swinging in normal walking. Since the red nucleus has sparse control over hands (as the Rubrospinal tract is more involved in large muscle movement such as that for Arms and Legs), fine control of the fingers is not modified by the functioning of the red nucleus (rather it relies on the corticospinal tract).